10 details you may have missed on Sunday's 'The Walking Dead'

You may have missed the tiny line of dialogue on Sunday's episode where Aaron briefly tells Maggie that they're going to check up on Oceanside. Aaron also teases that we may finally see a long-missing character, Cyndie (Sydney Park). He tells Maggie that he plans to fill both her and Rachel — Oceanside leaders — in on their plans for rebuilding their communities.

We're hoping that next week's episode starts with a flashback to show what happened to the Oceanside crew. April's season 11, episode 16 ended on a cliffhanger with Lance deciding the fate of the community.

Since then, we have no idea what happened to them.

It's possible that they all could've been killed by Lance's people and that all Aaron, Jerry, Elijah, and Lydia will find on the road is them as walkers, which would be incredibly heartbreaking. Hopefully, we get some resolution there.

On Sunday's episode, Lance warns Governor Milton that if anything happens to him that "certain alliances the Commonwealth has, certain stabilizing factors, are likely to become a problem."

Is he bluffing? Maybe.

If not, it's possible that Lance may have connections to another community we've yet to see. As a reminder, on season 11, episode 13, Lance hinted that he redirected some of the resources to rebuild Alexandria toward some other, unnamed project, which he referred to simply as "that other thing."

We're hoping it's revealed that Lance has come across someone from the Civic Republic Military (CRM), the group of over 200,000 that was showcased on spin-off "TWD: World Beyond." They're also the group that Rick was apparently taken to when he left "TWD" in November 2018.

It's tough to imagine that a group that massive wouldn't be aware of the Commonwealth, which has roughly 50,000 survivors. The main CRM outposts are located in upstate New York and Portland, Oregon. A third site, in Nebraska, was destroyed. The Commonwealth, meanwhile, is in Ohio.

Since we know Rick is eventually returning in a spin-off series of his own with Michonne, it would be a perfect way to connect the larger "TWD" universe.

If you couldn't remember what he was referencing, on season 10, episode 16, Carol considered taking her own life by falling into a chasm with a horde of the dead to end the pain and loss she's carried over the years.

In an emotional moment, Lydia pulls her back from the edge, helping her to find the strength to live and continue to be a part of the community.

R.J. is seen reading issue No. 56 of "Invincible," another comic from "TWD" creator Robert Kirkman.

It's not the first time the comic has appeared on the series. R.J.'s brother, Carl, who also loved comics, was reading "Invincible" on season six episode 10. Before that, Carl was seen reading the very same issue as R.J. on the season four premiere. It was tucked in a pile of comics that Michonne, R.J.'s birth mother, gave to Carl.

It may be safe to assume that this very comic is from Carl's collection and has been passed down to his brother.

While venting to Max, Sebastian reveals that he had a brother who died, suggesting that his loss is partially why Sebastian acts out in the way he does. In the comics, Sebastian is an only child.

When Insider asked Laila Robins, who plays Sebastian's mother, about the change during a pre-season interview, she told us Sebastian's nameless older brother was created to give her character and the Milton family more depth.

"When we were thinking about the backstory, we were trying to figure out why I'm particularly so disappointed in Sebastian and it's partly because I think that we decided that the previous son — why not have a previous son that was really the golden child who was supposed to sort of carry on the legacy?" Robins told Insider.

"Having lost that child, now I've got this creature to deal with who is not the day at the beach," Robins added with a laugh, speaking of Sebastian. "This is a difficult child and how disappointing that is because I see the potential of the bloodline, but he's just not stepping up to the task."

When we asked if Sebastian's older brother was given a name, Robins said she was never told one.

"No... I think it was more out of discussions with the directors and stuff, if I'm not mistaken, that we kind of came up with the backstory. It wasn't something that was sort of presented to me up front," Robins said, adding of Sebastian, "We kind of had a discussion about, 'Hey, wouldn't it be cool if he was like the second child and very disappointing?'"

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With everyone running around near the episode's end, you may have missed this really sweet interaction. Since Jerry's off traveling with Aaron, Nabila is alone with her and Jerry's three kids.

Unable to carry all three, Ezekiel steps in to pick up one of their kids and carry them out of harm's way when the undead enter the plaza. Jerry has always had his king's back at the Kingdom. Unsurprisingly, Ezekiel also has Jerry's.

About halfway through the episode, Gabe tells Rosita that he wishes he had received some cotton candy from the members of his parish before they hit the road to return to Alexandria.

According to official photos from the episode, it seems there was supposed to be another brief scene between besties Eugene and Rosita where she was shown carrying two sticks of the sweet treat.

Rosita was likely on her way to give one to Gabe, which would've been a nice gesture since their relationship has been a bit fractured in recent seasons. It also would've made sense to see Eugene tell one of his best friends that he was about to divulge information that would lead to potential disaster in the community.

But we never see any of this. Hopefully, she got it to him before chaos erupted in the Commonwealth near the episode's end.

If Sebastian's death completely caught you off guard, there were some hints throughout the show that the self-absorbed and spoiled son of Pamela Milton may meet his end by a member of the undead.

Ever since Sebastian was introduced on "TWD" on season 11, episode seven, fans have been aware that he has absolutely zero survival skills when it comes to dealing with the undead.

Time and time again, Sebastian has tried and failed to kill walkers set up as target practice for him. Daryl and Eugene have had to put the dead down to make sure he was safe. We knew that if Sebastian ever had to go toe-to-toe with a walker that he probably wasn't going to fare well and that ultimately led to his demise on Sunday's episode.

In the comics, Sebastian gets the series' most controversial moment when he kills the series' protagonist, Rick Grimes. Teo Rapp-Olsson, who plays Sebastian, told Insider he didn't know he was going to die until he read the script for Sunday's episode.

"Normally with these kind of things you will get the call from Angela Kang," Rapp-Olsson said of series' showrunner. "I was being a nosy actor and had actually talked to somebody in one of the other departments who was like, 'Oh yeah, I got a copy of this script. Crazy things that happened to you.'"

"I got a copy of the script and it was like, 'Wow, that's a very crazy thing that happened," Rapp-Olsson said of getting bit on Sunday's episode.

Like comic fans, Rapp-Olsson also wondered if he was going to kill off someone big.

"Honestly for most of my time on the show, I was sitting there theorizing the same way fans where like, "Ooh, who would I kill? Would it be Aaron or would it be Ezekiel?" Rapp-Olsson told Insider via a Zoom interview on Friday.

"When I first came on, it wasn't even necessarily gonna be the case that I would be in it more than three episodes," he revealed.

Rapp-Olsson added that he knows Sebastian's show death may have been a satisfying turn of events for fans who may have been upset with Rick's comic death and that Sebastian got to survive the comic.

"I know what this character has meant to so many of the fans, especially the ones who read the comics and even by now ones who have watched the show," Rapp-Olsson said of Sebastian.

"Everybody has been super nice. I have not received any kind of negative feedback," Rapp-Olsson added of not receiving hate mail from fans. "Everything has been very much like, 'I love to hate you. I hope you take that in the right way.' And I was like, fair. Then I've done my job well."

You can read our full interview with Rapp-Olsson here.